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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c01039bb06488839d6ffce4758da7884153b64630759d549ddeb7660591e01' 
  AND token = 'VC1nKHWY1bMg1wpuwA0ElKjMX6I4Cg1GnPBb03CpFvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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