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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b5b3c1666c12f36464220a2359b667b739701de1318de36f7ae7a6cbbbfc85' 
  AND token = '+//oOZ6X9K2fLgrVfEeObs0AYFyBwMyhtheRVgHaevE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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