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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d9a244abdabbe2ab034b594cd8ce75796adcab8f165ae4643b100afcc3075c' 
  AND token = 'EwKEq7U6rk3vMjupDYmW8NVBifJ3l+JJkGxgCiBJy44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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