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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d0a098c563131127ebf0d359dbdab960ba0292155e29d693833582d091528b' 
  AND token = 'Ojq04r1huGNeR0a7lUjOpqqOp1LLVRgKfPWm0RPPZ1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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