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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048aecf3444ad52a246ef3e92cf07d4c743135e6b04efaf33b92acbaf9ec97ac' 
  AND token = 'FAs6FLS/IiTHU0eeNDMDjDr4V6tlQbe4JjkIo0M2A7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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