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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb21495839c26030585cfda7aace2393cce81f6b5ceab03cc9ffbd2925efffc' 
  AND token = 'T1BQUMyvAV1anoNg/lclNEyMIV56se3RCvXRw7UV1U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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