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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac53760469132c2090431e082d629562f091cb0440bfd22e96cb2c0400559fff' 
  AND token = 'KfzDtxNPc0kC341whdNBPQqHBhS1rrtF6gUQHmhmGOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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