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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550834a160bf77ff370a2e162e1255ef7788c310bec2eaa6a17572dc6a8be73d' 
  AND token = 'UR+ip72ODyfAxfK9sTyO7jYPkt4KyFirABAA+d6g1PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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