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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09bb1c5a9939cd1a24c182ec37936fe3238a44546da46b4c416329ca94478a1' 
  AND token = 'EQdSxSxM6eb0WWaqKet07AXy1C/4GUbFt5bRm2Y88wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00133

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}