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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774709bc8aaa4feedb509c62806084daed63cb5e91c1ecb36bba7e4b7b333cb4' 
  AND token = '4jg3eqICfSa6/aCRV9lACO2IF5qS9Yvs64TtII1ziac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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