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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de17cfd23776f220ea937b6d694fbdb7273e5a0156017783660dac382492fba' 
  AND token = 'x8Iyhvam9b0387iTR5rSL4woNCMlpdKRO0ulGmRNsqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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