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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe05b97b5ed4e490b60366fffffabc2b8c39ad9a0c6eb0a46b9fa954855fef1' 
  AND token = 'fA9kCWjX41eJP5vk5r2rwq2lSARyq6xxJIU9oXI43Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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