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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f0904206d0dd3c64f60094d8f1f000938ad6fbff13c1cf9e6eac8a7527f01e' 
  AND token = 'ks6GUR2y7rHAJtDrxhCvgcbgKqLTFLsD7MgKL5zYNKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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