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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb0c3ad9adb300a887defc4baf3ef0fbfccd81baec3f6094893394828d25728' 
  AND token = '5oitf688qGI22rmReg3LY097XpnsJODciFGJuuTHn1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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