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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd230a6135deb79172a572357c751b3843e726c3cf16d6a123bb282bfc5791e' 
  AND token = '5IOE55zVQ4IR9KcZlq4zvDWKnRGUGuI303s5sFdWTtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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