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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5981ab758bb260023810727f4825a4ce3d66e1aaa718ad1e0464b58a1fd2482e' 
  AND token = 'h9c6i7oo7uEuamJgc1u7L91oD3IkDJLRi/LVq6Feg94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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