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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62e9ec373562f92006168a64f76f907a910371c481b5ad71f0776be6aa4226b' 
  AND token = 'qqeabNlJKXC6FY2Ofp55FyAEfHaSjl0tGM3V2jCcZZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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