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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72ae637e1d3e0e69b66b4879ff3eb56e7be54194cf0019805c99c9be08d9bdc' 
  AND token = '4ZV1djVSuLQR0jrdGThfjGvdWyTKl/arVgI34yVbR8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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