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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cab1a0369a5df81af10feaa56682d311c35514c0c1b9de3f73558c5e1f2220' 
  AND token = 'ukkDCPE4n0r5OQ+zZIjCwfiAMi37djOQbnFBWu1jwCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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