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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3c6bbe6157d6c24efe26aa5987681f626cac990d19a28a0ca9d22610aec9c3' 
  AND token = 'cWAs2Ez6RCOV4B0sxEXCNkILHgmFGq9zqiE76Th54GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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