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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80f136bad9f27a40fa21ddeca88502e5dbf5598f8cdeb5c4c618b8add836f92' 
  AND token = '8K9HiwCUfZgNUMn9lFeBnmnZu8oSnoum+l2pWXwa018=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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