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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3586eadc153c2aef0167c21abcc62f85faa26317cbe91f70f9705a4a5342a2' 
  AND token = 'ihVngecWCjb+5Tzj0kUUHKFEKsRi/emilsSQJucW8BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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