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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93032988133b9bffaffa11162dc508e8706ce7a38af4b724e55af63d5393c7d5' 
  AND token = 'qoFj39+qzZFdiZafp9nt120cUexmZ0EMj1Dn+8cOmWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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