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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113b6c48c0c1f7527cad7e29cd3445efc92d27dc010576ca1cf1d5c0c50f9719' 
  AND token = 'YGFdGb95eJ/0Nw4hdgHhChMYssRlp8uLIlgmIcsglWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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