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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cbc6418b624e11af25d6886b6617c57cd9937fa435ddead16b0a6e56f83d82' 
  AND token = 'T6Zb4qHWAagmte5a7Yq2hpX0Xa9iGZfKP2uNRW1PfRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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