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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b186b6f3abeebcb64b98673ae114fd26d20190fc7a67b2a0653946a466d01ba0' 
  AND token = '/l6P4cy4i6xFYuBwgVMXxoZC9DtpBdo7p4Awkggi5EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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