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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705f2de2ba33e7c1a0abf8084ede72c66f10fea3c20c6c48d25d0193e6c19d56' 
  AND token = 'OJAOS5XurZ/rgD9b+zGbikh7MTe7a1/0xEqnGGsXwMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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