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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e8c5459575a80ca86932f61dba6b41dfbc610b7fddafad3400bf9dc1e78f5b' 
  AND token = 'TggJ+Jkgk8IdC1l1OTzV04+y9tX8WsPtN0uODZwUoxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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