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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1e935f089c8a0aa843963dfdd134375989c49f3e0271418661d628026c129c' 
  AND token = 'PmvtgfkLLR69C5zfLpfGQ26NjPsa2fIkyFlEHTx+S+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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