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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cee97767f6f566ad1c716aeb3bc445fa2a36da955445d228c580e67780cf17' 
  AND token = '+DiTRjcvSgFYmMtYFyXhsNCJgrQ0YxSfGt3o6Dy4Dck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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