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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9bf6cc55dfbaaf389b0c87605d7f0c3fcc7f7da927ece466b888806d7cc001' 
  AND token = '8n/rsT0NLw5BtGTzMIZu/1p0CYFe2L9vB8Q1q11q3DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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