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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a25dbce7159197f0c9f21b3da93b7cd4b71e0075cfe3e963f3e44949b33a1a' 
  AND token = 'jxdweHxRTmPI7y+ItqKLN/S9SVlSr4ONOW9DilvK8q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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