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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697fc1a1f3ffdccfa59640d04600cbe8c04ec321682a8640b5ac6475ecedb138' 
  AND token = '1f2mCllCeu2hcX1Q1UKKIUO/WsW3NXb8zOQFgKnPjBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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