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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef235495b528225b995c0ef3ad96bad0f4ace6f839874a0013c524da9ae51bb5' 
  AND token = '4Ls3bvL2EWn5qE2r6rAZmmFC9vvlFxuMV0ndvlmTclo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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