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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84af8a636c81104c63e40db292247ec1b0a0ba148c23ad1105b340485c4285b' 
  AND token = 'uO5l67RAnyUvROBkMg5wOWelc3v3MTWykJwPOHn1DOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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