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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a5e1eb147bcf77601c27bd7e0b54b9d05688d3e704ae882f575b1fb703da59' 
  AND token = 'uif5oGUJgRQhLekVPk7qNLFgHIzzdhi1/CfsFu7HrUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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