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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f93ec22b0ba630e0d0fce1b138b84427706e18cd671a8455d04b543d3c5958' 
  AND token = 'zyp8rcaA68ekB1I+iJZrgJnkkbuX73i79nUVxoUgGNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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