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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f42bf2db5568df0e1668edec2ef2c68cf486292d37e7e56f41fa80cfaa8ab0' 
  AND token = 'tX7cNUQREQ5T6cmL+3MFslIED4JR0C19gxrw/XYpE9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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