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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f030d488e317d126b83f724acf660c3a862692b96ed1c0486cbff814f6199a' 
  AND token = 'BX2yy771jnU4CRTllEWOqy7h/pigIQnaCl8c3bl/kDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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