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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffc3583c1e70aab3d749ab9d1d3e75e534a29b92ca140de15aa24c3cca1f48b' 
  AND token = 'X0qW5T7c2pQ4oA1agKswWAeayKtebr9Irgkj/86vX+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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