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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3662aa9128b6b389b88c2ce4195c3d1111d32a3daf96b5b2058b97e4f60efc88' 
  AND token = 't8mW7PTiVSjqKfb/B6isaA6r5SbdxUig2D1w+n4SjSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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