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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ad1df9e6b05508f63925f4d1aea526b185deb93dd9c2af7937e3b444a47dec' 
  AND token = 'u74w1Og17BaTIFDqVS2ki48UmrwMgNHlvCRNSi6JDZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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