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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef45fbfe0600d7775d81b0f1ce897f7b7a7f4bbe295d155e3ee11cdbaf1e86d' 
  AND token = 'zlzElr0/FoVdsWbE79HnULtNUBfjnLT9QTVxuxnCsOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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