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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca160cd02cb0c06f9e3217ddca0acd75e44c624a9674caef4cde4b71d24b396f' 
  AND token = 'Q0ZOMtRadv0V89WEiK/PHUY4RvSZcJuptMzD/K1bDPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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