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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f585f113b2a1aab7ef286ee16f249ff7830fef09c9e98f9aea5b08a94bd2e9' 
  AND token = 'Q/IWC2b5T2awGc+0LLUekf2BoHnSwU2+9Ko/L9FfHNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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