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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19b0484503f598c6fea3c6303cbe680660f90488aea6c68367a2aefb7fd7b9e' 
  AND token = 'DmamUwaofDgt7ctUy24dX4pw5K08M6m7FoZSkr4JqN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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