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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76d598d0b1a223b98c01e624ebc75eb55a0140cf598389778d552ee1a0e8fc0' 
  AND token = 'hYcRXmHiYIQm27m2B/X2HXU/IsmCLAw57k60/5UAL6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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