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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7bb28efded67b166bc0185cefc2c1e6623044a453e9dd81eece1338ff88964e' 
  AND token = 'eP3G9k7rjnflGCFnjdt1yfFYlovtWOISeBK1h0Q0JYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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