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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3c954d0e009bc3fa2698255f2db4bda764279653c38be22d730e815d0a1988' 
  AND token = 'gC9zS+N16bFTzVmowG9nItrzlQXzsJJQHQMSm6iN4cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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