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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39cd0ca7034c53e359fedc046f2f8873ddc6670ab1876c6aec7ff0b92911eaf' 
  AND token = '3WvFHjQJtfn6M6dmR4bXpNs5rElVQmBnoQbs5ozaO5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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