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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fa01dac0372736a5341d2bce618e2ea581c8b17330d7649e26eed20d71b1d2' 
  AND token = 'kQx5HES0rY4IyN7d7cM0RUokbOrz5CH4CgcX4/FPbho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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