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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd815288cbfccf1ea9f5d8559e5f59c216c4b19f149ccd3b5bfc20e77e51accd6' 
  AND token = 'hXgz6lpQkOOX/4ndmM2jwFWxjNE/5c7MhQ3oUVeEe6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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