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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa3caa4c06eb75df45e0dfd9b98a1a7e1ebf71e2fd0b74962118d96393e3ba0' 
  AND token = 'ywgBxJyzUVVSRUIbxZbxT7XRwlpNJWimJuLLYJc4/3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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