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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ee9ebf69327b07e57af55ed45e8998f07848b686a4525ecfcd0235eee3ace7' 
  AND token = 'h2oJ2QqAFTpGJvZd6Sfo/xjL1ghCVsSbercXrjBmAJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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