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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c7913ee18eb9aaa3dc7f943b2264395d31a444308cc74479faef6bb56af2dc' 
  AND token = 't5jW+dwB/josrt5jGrIYTyPd3W9anPYGTSYj1g2rc2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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