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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ae8116a48987fe20a779719ed40640b73c8ec64d34ed68559bb823ccd088ef' 
  AND token = 'EybPkqW3aBKkbTrVkee6/B2Jj/51tXM1HXMlyJxh6EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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